/*
 * Copyright © 2024 Rémi Denis-Courmont.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "libavutil/riscv/asm.S"

        .variant_cc ff_h264_loop_filter_luma_8_rvv
func ff_h264_loop_filter_luma_8_rvv, zve32x
        # p2: v8, p1: v9, p0: v10, q0: v11, q1: v12, q2: v13
        # alpha: a2, beta: a3, tc_orig: v6
        csrwi        vxrm, 0
        vaaddu.vv    v14, v10, v11 # (p0 + q0 + 1) / 2
        vwsubu.vv    v16, v9, v12
        vwaddu.vv    v18, v8, v14
        vwaddu.vv    v20, v13, v14
        vnsra.wi     v24, v16, 2   # (p1 - q1) / 4
        vnsrl.wi     v14, v18, 1
        vnsrl.wi     v15, v20, 1
        vneg.v       v5, v6        # -tc_orig
        vwsubu.vv    v22, v11, v10 # q0 - p0
        vwsubu.vv    v18, v14, v9
        vwsubu.vv    v20, v15, v12
        vwadd.wv     v16, v22, v24
        vmsge.vi     v7, v6, 0     # tc_orig >= 0
        vnclip.wi    v14, v18, 0
        vnclip.wi    v15, v20, 0
        vnclip.wi    v16, v16, 1   # clip8((q0 - p0 + (p1 - q1) / 4 + 1) >> 1)
        vmin.vv      v14, v14, v6
        vmin.vv      v15, v15, v6
        vmax.vv      v14, v14, v5  # clip(p2 + ... - p1, +/-tc_orig)
        vmax.vv      v15, v15, v5  # clip(q2 + ... - q1, +/-tc_orig)
        vwsubu.vv    v20, v10, v11
        vwsubu.vv    v24, v9, v10
        vwsubu.vv    v26, v10, v9
        vwsubu.vv    v28, v12, v11
        vwsubu.vv    v30, v11, v12
        vwsubu.vv    v0, v8, v10
        vwsubu.vv    v2, v10, v8
        vwsubu.vv    v4, v13, v11
        vwsubu.vv    v18, v11, v13
        vsetvli      zero, zero, e16, m2, ta, ma
        vmax.vv      v20, v20, v22 # abs(p0 - q0)
        vmax.vv      v24, v24, v26 # abs(p1 - p0)
        vmax.vv      v28, v28, v30 # abs(q1 - q0)
        vmax.vv      v22, v0, v2   # abs(p2 - p0)
        vmax.vv      v26, v4, v18  # abs(q2 - q0)
        vmslt.vx     v1, v20, a2
        vmslt.vx     v2, v24, a3
        vmand.mm     v7, v7, v1
        vmslt.vx     v3, v28, a3
        vmand.mm     v7, v7, v2
        vmslt.vx     v0, v22, a3
        vmand.mm     v7, v7, v3    # whether to update p0 and q0
        vmslt.vx     v1, v26, a3
        vmand.mm     v0, v0, v7
        vsetvli      zero, zero, e8, m1, ta, mu
        vadd.vi      v6, v6, 1, v0.t     # tc++
        vadd.vv      v9, v9, v14, v0.t   # p1'
        vmand.mm     v0, v1, v7
        vadd.vi      v6, v6, 1, v0.t     # tc++
        vadd.vv      v12, v12, v15, v0.t # q1'
        vneg.v       v5, v6              # -tc
        vmin.vv      v16, v16, v6
        vwcvtu.x.x.v v18, v10
        vmax.vv      v16, v16, v5
        vwcvtu.x.x.v v20, v11
        vwadd.wv     v18, v18, v16
        vwsub.wv     v20, v20, v16
        vmmv.m       v0, v7
        vsetvli      zero, zero, e16, m2, ta, ma
        vmax.vx      v18, v18, zero
        vmax.vx      v20, v20, zero
        vsetvli      zero, zero, e8, m1, ta, mu
        vnclipu.wi   v10, v18, 0, v0.t   # p0'
        vnclipu.wi   v11, v20, 0, v0.t   # q0'
        jr           t0
endfunc

func ff_h264_v_loop_filter_luma_8_rvv, zve32x
        vsetivli  zero, 4, e32, m1, ta, ma
        vle8.v    v4, (a4)
        li        t0, 0x01010101
        vzext.vf4 v6, v4
        sub       t3, a0, a1
        vmul.vx   v6, v6, t0
        vsetivli  zero, 16, e8, m1, ta, ma
        vle8.v    v11, (a0)
        sub       t2, t3, a1
        vid.v     v0
        vle8.v    v10, (t3)
        sub       t1, t2, a1
        vle8.v    v9, (t2)
        add       t5, a0, a1
        vle8.v    v8, (t1)
        add       t6, t5, a1
        vle8.v    v12, (t5)
        vle8.v    v13, (t6)
        jal       t0, ff_h264_loop_filter_luma_8_rvv
        vse8.v    v9, (t2)
        vse8.v    v10, (t3)
        vse8.v    v11, (a0)
        vse8.v    v12, (t5)
        ret
endfunc

func ff_h264_h_loop_filter_luma_8_rvv, zve32x
        vsetivli    zero, 4, e32, m1, ta, ma
        vle8.v      v4, (a4)
        li          t0, 0x01010101
        vzext.vf4   v6, v4
        addi        a0, a0, -3
        vmul.vx     v6, v6, t0
        vsetivli    zero, 16, e8, m1, ta, ma
        vlsseg6e8.v v8, (a0), a1
        jal         t0, ff_h264_loop_filter_luma_8_rvv
        vssseg6e8.v v8, (a0), a1
        ret
endfunc

func ff_h264_h_loop_filter_luma_mbaff_8_rvv, zve32x
        vsetivli    zero, 4, e16, mf2, ta, ma
        vle8.v      v4, (a4)
        li          t0, 0x0101
        vzext.vf2   v6, v4
        addi        a0, a0, -3
        vmul.vx     v6, v6, t0    # tc_orig
        vsetivli    zero, 8, e8, m1, ta, ma
        vlsseg6e8.v v8, (a0), a1
        jal         t0, ff_h264_loop_filter_luma_8_rvv
        vssseg6e8.v v8, (a0), a1
        ret
endfunc
